Grinding noise upon turning is normally one of two issues. First, and most often, it is caused by a worn out outer CV joint. If your vehicle has more than 50000 miles on it and the axle shafts have never been replaced, this is what I would suspect first. In addition, CV noise will be louder when turning under power (gas pedal pressed) than when coasting into a turn. The other possibility is a front wheel bearing assembly. These are not as common, but do wear out as well. The wheel bearings will usually make no noise when going straight, but will make noise upon even the slightest side to side turn. CVs on the other hand, usually grind only when going into corners or making left or right turns. If you suspect a CV joint, but don't have high mileage, you could have a torn CV boot that resulted in the grease that lubricates the joint being depleted and causing the noise. You can inspect the out boots visually for tears....grease leaking out usually leaves telltale spatters in the wheel wells also. Replacement of the CV joint can be done, but it is usually cheaper to replace the entire axle shaft as they are serviced as a unit.
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